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Fluid is drawn out of the tank sump and passes through
the pump. From the pump the solution passes through
the filter and filters out or grinds up most undissolved
chemical and solid particles. The fluid then passes
through the agitation valve and returns to the tank via
the agitator head or proceeds through the pressure con-
trol valves. If the fluid passes through the electric pres-
sure control valve, it proceeds to the 3-way solenoid
valves. If a solenoid is on, its coil is energized and the
connected valve is open. The fluid will pass through the
valve and travel to the specific boom section (left, center
or right) and is delivered to the area to be treated
through the sprayer boom nozzles. If the particular
switch is off, the solenoid is de-energized and the con-
nected valve is closed. In this case, the fluid travels
through the bypass and returns to the tank sump.
You can monitor the nozzle pressure gauge and adjust
the pressure to the booms by adjusting the pressure
adjust switch on the control box. The pressure adjust
switch operates the electric pressure control valve. To
set this valve, see Pre-setting the Pressure Control
Valves in the next column. This will decrease the
amount of flow to the electric pressure control valve and
reduce its sensitivity.
There are tank shut off valves at every tank outlet so
that if there is a leak, the contents of the tank can be
secured and a chemical spill avoided. These valves
(except for the tank drain valve) need to be fully open
when the sprayer is in use.
Pressure Adjustment Valves
NOTE:
Refer to Sprayer Parts Manual if you need help identify-
ing specific sprayer components.
The plumbing system is equipped with two pressure ad-
justment valves, electric and manual. The two valves
work together and understanding how they work is im-
portant to proper sprayer operation.
The Electric Pressure Control Valve
The primary purpose of this valve is to allow the opera-
tor to adjust boom pressure while spraying. The electric
pressure control is a 12 volt DC operated butterfly type
valve. It is controlled by the pressure adjust switch on
the control box. When the switch is engaged, electric
current travels through the gearbox controlling the valve,
saucing the butterfly mechanism to move. The valve
has no stops and can be adjusted a full 360 degrees.
The Manual Pressure Control Valve
The main purpose of this valve is to reduce the sensitiv-
ity of the electric pressure control valve so that small
movements of the butterfly valve mechanism won’t re-
sult in uncontrollable changes in boom pressure. With-
out the manual pressure control valve, toggling the pres-
sure adjust switch just a few times will result in fast pres-
sure changes in boom pressure, adversely affecting ap-
plication rates. This manual valve restricts the amount
of flow to the electric pressure control valve, thus nar-
rowing the range of pressure.
Pre-setting the Pressure Control Valves
(Manual Control Systems Only)
NOTE:
Before beginning this procedure make sure your throt-
tling valves are adjusted. Refer to Calibrating the Throt-
tling Valves in General Operations starting on page 19.
To adjust the pressure control valves and achieve a de-
sirable adjustment range at the control box, do the fol-
lowing:
1. Open the electric control valve (by toggling the pres-
sure switch at the control box) until the valve is fully
open.
2. Turn the boom sections off so that the liquid is trav-
eling through the bypass line and retuning to the
tank.
3. Operate the pump at the same RPM you would
when spraying.
4. Adjust the manual pressure control valve until the
boom pressure as indicated on the pressure gauge
by the control box is 10 to 20 PSI greater than the
maximum application pressure.
The Drive Pump
IMPORTANT: The Hy Pro pump supplied with your
sprayer is not designed for use with every application.
Materials containing solvents, paints or solutions con-
taining abrasives will damage the pump. If you are un-
sure of you chemicals, consult your dealer for suitability
of your application.
IMPORTANT: Always use the MASTER on/off switch to
control spraying action.
PTO Drives
The pump on this type of drive is powered by the vehi-
cle’s PTO shaft. The PTO shaft is manually operated by
the driver and once engaged, turns regardless of gear
selection. The speed of the PTO is directly proportional
to engine speed. Higher engine RPM results in higher
PTO (and pump) speed, and ultimately higher system
pressure (70 lbs. PSI Max.) for spraying.
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